# NR716: Week 7 Statistics

Question 1 pts

When researchers set the level of significance, they are thinking about the possibility of Type I and Type II errors. When researchers are testing the effect of chemotherapy on cancer, in terms of safety, which error has the more dangerous consequences in this setting?

Group of answer choices

Type I error

Type II error

Question 2 pts

Which of the following is considered a continuous variable?

Group of answer choices

The genders of students in this class

The total number of students in this class

The hair colors of students in this class

The healthcare specialty of students in the class

Question 3 pts

A Ph.D. nurse performs an experiment testing the frequency and correlation of the participant demographics. He plots a histogram measuring income versus education level. He produces the following graph below. Which of the following describes this distribution?

Group of answer choices

Normal

Bimodal

Left Skewed

Right Skewed

Question 4 pts

A famous study examined the smoking habits of British doctors and whether the doctors developed various types of cancers. Participants responded to questionnaires about their smoking habits and health in 1970, 1985, 2000 and many more times all the way up to 2010.

What type of observational study is this?

Group of answer choices

A prospective study

A retrospective study

A sample survey

None of these. It’s an experiment, not an observational study.

Question 5 pts

Which of the following variables is considered to be a discrete variable?

Group of answer choices

The height of the patients

The blood pressure of the patients

The temperature of the patients

The gender of the patients

Question 6 pts

The standard deviation describes which aspect of the data sample:

Group of answer choices

It is the amount of variation or dispersion of the data in a sample.

It illustrates the distribution curve

It describes the average data point in the sample

It approximates the absolute value of the mean

Question 7 pts

A Ph.D. nurse performs an experiment testing the frequency and correlation of the participant demographics. She plots a histogram measuring income versus education level. She produces the following graph below. Which of the following describes this distribution?

Group of answer choices

Normal

Bimodal

Left Skewed

Right Skewed

Question 8 pts

The mean measurement of central tendency is calculated by _____.

Group of answer choices

placing all data collected in numerical order and selecting the middle number

subtracting the lowest number from the highest number

dividing the total sum of all the data by the total number of data points

by selecting the most frequent data point

Question 9 pts

The frequency distribution informs us about:

Group of answer choices

Subgroups within a dataset when the groups are divided into four equal parts

How many times each value occurs within the sample data

The general population from which the sample was taken

The significance level

Question 10 pts

What is the mean of the following numbers? 6, 4, 1, 9, 3, 8, 3, 5, 10?

Group of answer choices

5.4

3

6

5

Question 11 pts

Using the interactive statistical flowchart, what is the definition of a normal data distribution curve?

Group of answer choices

The data are arranged in a straight horizontal line. The data are 3 standard deviations away from the mean.

The data is distributed evenly from the mean. Most data is less than two standard deviations from the mean. The data are in a bell curve illustration.

The data is samples normally and is arranged in a scatter plot as a flowerpot illustration. The data is less than two standard deviations from the mean.

The data is normally collected and illustrated by a wavy curve distribution. The data are two standard deviations away from the mean with some outliers.

Question 12 pts

Using the interactive statistical flowchart, the assumptions for the Pearson’s r test are ALL the following EXCEPT:

Group of answer choices

The data must be parametric data

The data must be normally distributed

The data is categorical (nominal data)

There is a linear relationship between variables

Question 13 pts

A student scores a 749 on the Scholastic Assessment Test (SAT). A college admissions committee does not know how the exam is scored; however, they do know the scores of the exam form a normal distribution pattern. They also know the mean score and standard deviation of the population of students that took the test. Using this information, determine whether or not the student scored well on the SAT.
Mean = 495
Standard deviation = 116

Group of answer choices

The student’s score was very good and 2 standard deviations above the mean.

The student’s score was average, similar to the mean.

The student’s score was poor and below a single standard deviation of the mean.

The student’s score was good and 1 standard deviation from the mean.

Question 14 pts

The DNP student is reading a research study article in which there are 4 groups. The level of measurement is nominal and ordinal level data. The researchers measured the difference between the means. Using the interactive statistical flowchart, what statistical test did the researchers most likely conduct?

Group of answer choices

Regression Analysis

Pearson’s r test

Kruskal-Wallis test

Spearman’s Rank Correlation

Question 15 pts

What is the median of the following numbers 9, 10, 6, 5, 6?

Group of answer choices

6

5

7.2

4

Question 16 pts

Using the interactive statistical flowchart, which of the assumptions below is an assumption for Chi-square analysis?

Group of answer choices

The data is collected with blinded researchers

The expected values totals is at least 5.

The data in the samples must be paired to each other

The sample size is at least 200.

Question 17 pts

The mean is influenced by _______.

Group of answer choices

the order of the data

the total number of the same values

the individual scores

the standard deviation

Question 18 pts

Which of these choices below are a defined collection of individuals or objects about which we want to draw conclusions?

Group of answer choices

Population

Census

Survey

Sample

Question 19 pts

Which of the following is correct?

Group of answer choices

none of the above

The probability of a type I error is β.

The probability of a type II error is (1 – β).

The probability of a type II error is α.

The probability of a type I error is (1 – α).

Question 20 pts

What is the mean (average) of the following numbers? 10,6,4,4,6,4,1

Group of answer choices

5

4

9

6

Question 21 pts

How will the removal of the lowest numbers in the data collected affect the mean (average) of the data?

Group of answer choices

The mean may decrease

The mean may increase

The mean will stay the same

It is not possible to calculate the mean in this example

Question 22 pts

The range of the data is calculated by doing the following:

Group of answer choices

Adding the individual numbers in the sample and dividing by the total number of observations in the sample

Selecting the number in the exact middle of the data sample

Squaring the variance

Subtracting the lowest value in the sample from the highest value

Question 23 pts

The DNP student is conducting data collection at the end of the implementation cycle in her DNP practice change project. The student also collected data before the intervention was implemented. The level of measurement is ratio and the student has parametric data. The student would like to measure the relationships between the pre-implementation and post-implementation samples. The student realizes she does NOT have a true independent variable. Using the interactive statistical flowchart, what statistical test will she conduct on his data?

Group of answer choices

John’s Relational test

Palatium test

Pearson’s r

Milli’s test

Question 24 pts

What is the word to describe Interval and Ratio Data in which the data is in order and has the same difference between all variables. Examples of this type of data ae height, weight, temperature, IQ and GPA.

Group of answer choices

Level 1 and level 2 data

Continuous data

Normalized data

Random data

Question 25 pts

The DNP student is conducting data collection at the end of the implementation cycle in her DNP practice change project. She collected categorical outcome data. Using the DNP flow chart for selecting common descriptive statistics, what types of statistical tests will he conduct on his data?

Group of answer choices

Median, Mode, Frequency

Mean, Range, Variance

Dunn’s test and Chi-Square

Kruskal-Wallis and Dunn’s test

# Solution:

Question 1

/ 8 pts

When researchers set the level of significance, they are thinking about the possibility of Type I and Type II errors. When researchers are testing the effect of chemotherapy on cancer, in terms of safety, which error has the more dangerous consequences in this setting?

Correct Answer

Type I error

Type II error

Question 2

/ 8 pts

Which of the following is considered a continuous variable?

The genders of students in this class

Correct!

The total number of students in this class

The hair colors of students in this class

The healthcare specialty of students in the class

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